1. The problem statement, all variables and given/known data What are the steps to factoring 3rd order polynomials like x^3+8x^2-21x+10? It's to find eigenvalues of a matrix in linear algebra, I completely forgot how to factor and it's killing me. 2. Relevant equations 3. The attempt at a solution None, unless its a polynomial that I can factor by grouping, I have no clue how to begin.